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Normal vital signs (blood pressure, heart rate, respiratory rate, temperature) and body mass index (BMI) between 18 and 30 kg/m 2 Suboptimal vitamin B12 status (deficient to borderline 200300 pg/mL), defined as serum B12 levels within the lower end of the reference range (234894 pg/mL) Able to provide informed written consent Able to comply with study procedures and follow-up visits as outlined in the protocol 2.2.2 Exclusion criteria Known hypersensitivity or allergy to oral vitamin B12 supplements or any of its components Known history of cobalt allergy or sensitivity Severe malabsorption syndromes, including pernicious anemia or intestinal disorders affecting vitamin B12 absorption Current use of acetaminophen, nonsteroidal anti-inflammatory drugs, antibiotics, antacids, proton pump inhibitors (PPIs), multivitamins, or nutritional supplements containing vitamin B12 History of gastric bypass surgery or other procedures that significantly alter GI anatomy or function Significant renal impairment (estimated glomerular filtration rate [eGFR] 0.05) Supplementary Table 1
[1] However, monitoring thyroid function is advisable after significant weight change or if symptoms change
The absorption process involves a complex mechanism requiring an acidic stomach environment, pepsin, and intrinsic factor, which facilitates the absorption of vitamin B12 in the intestines
Compared to retinol, GHK-Cu Repairs without damaging the skin barrier It is gentler and better tolerated Supports healing instead of causing controlled injury While both these anti-aging solutions are effective, GHK-Cu may be a better and more comfortable option for people with sensitive skin or long-term use
Although vitamin C and caffeine found in some supplements can be mild diuretics, increases in urination frequency are more likely related to increased water consumption
